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08 Feb 2008, 12:08

JCLEONES wrote:

Could you please elaborate on the solution?

Thanks

eschn3am wrote:

5C4 = 5

Answer A

We have a pool of 7 people and we want to know how many ways we can form a group of 4 that does NOT include 2 of the members. Essentially, we're cutting the pool of 7 down to a pool of 5 and looking for the number of ways to choose 4.